Grinding machine guide block



lMay 28, 1935. J. SUNNEN 2,002,649

'y GRINDING MACHINE GUlDE BLOCK Filed May *7, 1934 *A n HY l lll IVI/IA Patented May/ 25, 1935 UNITED STATES PATENT OFFICE 9 Claims.

My invention has relation to improvements in cylinder grinding machines and it consists in the novel features of construction more fully set forth inthe specification and pointed out in the claims. Y

Thepresent invention is directed more particularly tothe guide elements of a grinding machine of the type shown in my co-pending application, Serial No. 233,788, led November 17, 1927, and is an improvement over the guide blocks forming the subject-matter of my Patent No. 1,929,613, dated October 10, 1933.

It is the object of the present invention to associate with the guide block a wiping element which rubs over the cylinder wall when the grinding machine is in use and removes loose particles therefrom that have been removed by the abrasive element in the grinding operation.

It has been found in practice that when the grinding elements or abrasive stones are of line texture for the finishing grinding operation their abrasive property is reduced and mayeven be entirely overcome by the accumulation on or loading ofthe stone with fine iron particles or iron dust that has been abraded from the cylinder wall. Of course the damage to the abrasive elements can be minimized if the grinding operation is discontinued at frequent intervals and the cylinder wall vbrushed or wiped to as they are deposited thereon.

The advantages of my improved guide element and its function as a wiper will be better apparent from a detailed description thereof in connection with the accompanying drawing, in which:

Figure 1 is a side elevation of a grinding machine provided with my improved guide elements, parts of said machine being broken away; Fig. 2 is a horizontal cross-section through the machine taken on the line 2--2 of Fig. 1; Fig. 3 is an elevation of one of the guide elements looking at the working face thereof, part of the wiper associated therewith being broken away; Fig. 4 is a longitudinal section through the guide element taken on the line 4-4 of Fig. 3; and Fig. 5

I have overcome the disadvantage of (cisl-184.1)

is an enlarged cross-sectional detail taken on'the line 5-5 of Fig. 3.

Referring to the drawing, I represents the tool holder of a Sunnen cylinder grinder of the type described in the above referred to patent application, said holder beingk suspended by a yoke 2 and collar 3 from a drive shaft 4. The collar 3 is pivotally connected to the holder I by means of studs 5, 5, and the yoke 2 is pivotally connected to thecollar by means of studs 6, 6 so that a universal joint connection is formed between the shaft 4 and the holder I. Thelholder I is provided with a longitudinally disposed axial bore l within which is housed a pinion shaftrotatable by means of the adjusting head 9 for the purpose of extending and retracting abrasive elements lil, I and guide elements II, II comprising the tools carried by the holder. The construction and the operation of the tool holder, comprising the parts just described, is substantially the same as that of the holder of my `honing device described in detail in the aforesaid patent application and will not be further described herein except insofar as necessary to explain the operation of the guide elements II, II.

The guide elements II, II comprise an angleshaped block I2 carried on the outer ends of rack bar I3 which form the support for the block, said racks being slidably mounted in transverse 'bores' I4, I4 intersecting with the axial bore 'I so that the teeth t ofthe racks Vwill mesh with the elongated pinion 8. The outer end of each rack bar i3 terminates in successively reduced portions I5 vand IB, the reducedV portion I5 passing through an `opening Il in what may be termed the base I8 of the guide block, while the reduced portion i6 passes through an opening I9 in a-retaining strip 20, over whichthe extremity of said reduced portion I 6 is riyetedMflhus-the retaining strip 2li is firmly fixed to the rack bar I3 in spaced relation with the shoulder s formed by the reduced portion or stem I5. It will be observed that the length of the stem I5 is greater than the thickness of the base portion I3 of the block so that space is provided between the inner surface I8 of the block and the shoulder s for a spring 2| in the shape of a concavo-convex washer or perforated disk. The spring washers 2l exert their inuence to hold the block I2 outwardly in contact with the retaining strip 20 and possess sufficient tension to hold the working surface 22 of the guide block firmly against the cylinder wall C when the grinding machine is in operation.

In operation the block I2 makes a yielding contact with the cylinder wall under the vibrations of the machines in the manner as does the guide block of my Patent No. 1,929,613 aforesaid. Since thev construction Which permits of such yielding contact forms no part of the present invention no further reference Will be made thereto.

Novel features of the present invention are the thin corrugated cylinder contacting element 23 and the felt strip 24 Which is cemented to the inner surface 25 of said element 23 by a layer of a suitable adhesive or cement 26.

The angular block l2, and of course the cylin- 'der contacting element 23, is composed of a material that is relatively non-abrasive as it must not score the cylinder Wall during its movement thereover, and it should also be comparatively friable so that when the pressure of the block against the cylinder Wall C becomes greater than normal it Will readily Wear off. I have found that one material possessing these properties is die cast metal containing approximately 94% zinc, 2% copper and 4% aluminum. The percentages `are not critical and may be varied Without materially affecting the properties of the resulting alloy. In performing grinding operations in which abrasive stones of close texture are used it is also desirable that the extent of the Working face 22 of the cylinder contacting element 23 be reduced to a minimum. It is for this reason that said element is thin when compared with the cylinder contacting element of the guide block shown in my Patent No. 1,929,613. Reducing the thickness of the element 23 obviously reduces its ability to withstand pressure, so I have compensated therefor by fonning the element 23 in the corrugated or zig-zag shape shown in Fig. 3. The corrugated shape of the element 23 provides comparatively Wide bearing support against the cylinder Wall Without unduly increasing the friction thereof When the grinding machine is in operation. The corrugating of the element 23 provides pockets El, 2l, etc., in Which comparatively heavy applications of cement may be made to insure a secure fastening of the felt strip 24 to the element 23.

When the grinding machine is in operation the rotation is in the direction of the arrows (Figs. 2 and 5) so that the ne particles of iron deposited on the Wall due to the abrasive action of either or" the stones lll will be picked up immediately by the felt strip 24 of the guide block i2 following said stone, said particles becoming lodged in the felt strip 24 from which they may be removed at the conclusion of the grinding operation. Thus the felt strip 24 serves to keep the surface of the cylinder comparatively clean and prevent the loading of the abrasive elements l0 with iron particles that ultimately destroy the eiiectiveness of the stone.

Having described by invention, I claim:

1. A guide element for cylinder grinding machines comprising a guide block adapted for contact with the cylinder, supporting elements for said block, and a Wiper fixed to the block.

2. A guide element for cylinder grinding machines comprising an elongated block adapted for contact with the cylinder, supporting elements for said block, and an elongated Wiper coextensive with and fixed to the block.

3. A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, and a wiper fixed to the block in the angle between said components.

4, A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, and a felt strip xed to the block in the angle between said components.

5. A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, said cylinder contacting component comprising a relatively thin, corrugated vane.

6. A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, said cylinder contacting component comprising a relatively thin, corrugated vane, and a Wiper of ilbrous material disposed in the angle of said components and cemented to said corrugated vane.

'7. A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, said cylinder contacting component comprising a relatively thin, corrugated vane composed of an alloy containing zinc, copper and aluminum.

8. A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, said cylinder contacting component comprising a relatively thin, corrugated vane composed of an alloy having a zinc base,

9. A guide element for cylinder grinding machines comprising a guide block having a base component and a cylinder contacting component in angular relation, supporting elements for said block, said cylinder contacting component comprising a relatively thin, corrugated vane composed of an alloy containing zinc and aluminum.

JOSEPH SUNNEN. 

